Initial commit

Co-authored-by: Doug Gregor <[email protected]>
Co-authored-by: Cory Benfield <[email protected]>

Author: 3 people

.gitignore

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+.DS_Store
+.build
+Packages
+xcuserdata/
+DerivedData/
+.swiftpm
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc
+*.class
+
+# Ignore gradle build artifacts
+.gradle
+**/build/
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+# Avoid ignore Gradle wrappper properties
+!gradle-wrapper.properties
+
+# Cache of project
+.gradletasknamecache
+
+# Ignore generated sources
+JavaSwiftKitDemo/src/main/java/com/example/swift/generated/*

BuildLogic/.gitignore

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+build
+.gradle

BuildLogic/build.gradle.kts

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+repositories {
+    gradlePluginPortal()
+}
+
+plugins {
+    `kotlin-dsl`
+}

BuildLogic/settings.gradle.kts

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+rootProject.name = "BuildLogic"

BuildLogic/src/main/kotlin/build-logic.java-application-conventions.gradle.kts

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+plugins {
+    id("build-logic.java-common-conventions")
+
+    id("application")
+}

BuildLogic/src/main/kotlin/build-logic.java-common-conventions.gradle.kts

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+plugins {
+    java
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(22)
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+testing {
+    suites {
+        val test by getting(JvmTestSuite::class) {
+            useJUnitJupiter("5.10.3")
+        }
+    }
+}
+
+/// Enable access to preview APIs, e.g. java.lang.foreign.* (Panama)
+tasks.withType(JavaCompile::class).forEach {
+    it.options.compilerArgs.add("--enable-preview")
+    it.options.compilerArgs.add("-Xlint:preview")
+}
+
+// Configure paths for native (Swift) libraries
+tasks.test {
+    jvmArgs(
+        "--enable-native-access=ALL-UNNAMED",
+
+        // Include the library paths where our dylibs are that we want to load and call
+        "-Djava.library.path=" + listOf(
+            """$rootDir/.build/arm64-apple-macosx/debug/""",
+            "/usr/lib/swift/"
+        ).joinToString(File.pathSeparator)
+    )
+}
+
+tasks.withType<Test> {
+    this.testLogging {
+        this.showStandardStreams = true
+    }
+}
+
+
+val buildSwiftJExtract = tasks.register<Exec>("buildSwiftJExtract") {
+    description = "Builds Swift targets, including jextract-swift"
+
+    workingDir("..")
+    commandLine("make")
+}
+
+tasks.build {
+    dependsOn(buildSwiftJExtract)
+}
+

BuildLogic/src/main/kotlin/build-logic.java-library-conventions.gradle.kts

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+plugins {
+    id("build-logic.java-common-conventions")
+
+    id("application")
+}

JavaSwiftKitDemo/build.gradle.kts

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+plugins {
+    id("build-logic.java-application-conventions")
+}
+
+group = "org.swift.javakit"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(22))
+    }
+}
+
+dependencies {
+    testImplementation(platform("org.junit:junit-bom:5.10.0"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+application {
+    mainClass = "org.example.HelloJava2Swift"
+
+    // In order to silence:
+    //   WARNING: A restricted method in java.lang.foreign.SymbolLookup has been called
+    //   WARNING: java.lang.foreign.SymbolLookup::libraryLookup has been called by org.example.swift.JavaKitExample in an unnamed module
+    //   WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for callers in this module
+    //   WARNING: Restricted methods will be blocked in a future release unless native access is enabled
+    // FIXME: Find out the proper solution to this
+    applicationDefaultJvmArgs = listOf(
+        "--enable-native-access=ALL-UNNAMED",
+
+        // Include the library paths where our dylibs are that we want to load and call
+        "-Djava.library.path=" + listOf(
+            """$rootDir/.build/arm64-apple-macosx/debug/""",
+            "/usr/lib/swift/"
+        ).joinToString(":"),
+
+        // Enable tracing downcalls (to Swift)
+        "-Djextract.trace.downcalls=true"
+    )
+}
+

JavaSwiftKitDemo/src/main/java/com/example/swift/HelloSubclass.java

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+package com.example.swift;
+import com.example.swift.HelloSwift;
+
+public class HelloSubclass extends HelloSwift {
+    private String greeting;
+
+    public HelloSubclass(String greeting) {
+        this.greeting = greeting;
+    }
+
+    private void greetMe() {
+        super.greet(greeting);
+    }
+}

JavaSwiftKitDemo/src/main/java/com/example/swift/HelloSwift.java

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+package com.example.swift;
+import com.example.swift.HelloSubclass;
+
+public class HelloSwift {
+    private double value;
+    private static double initialValue = 3.14159;
+    private String name = "Java";
+
+    static {
+        System.loadLibrary("JavaKitExample");
+    }
+
+    public HelloSwift() {
+        this.value = initialValue;
+    }
+
+    public static void main(String[] args) {
+        int result = new HelloSubclass("Swift").sayHello(17, 25);
+        System.out.println("sayHello(17, 25) = " + result);
+    }
+
+    public native int sayHello(int x, int y);
+    public native String throwMessageFromSwift(String message) throws Exception;
+
+    // To be called back by the native code
+    private double sayHelloBack(int i) {
+        System.out.println("And hello back from " + name + "! You passed me " + i);
+        return value;
+    }
+
+    public void greet(String name) {
+        System.out.println("Salutations, " + name);
+    }
+
+    String[] doublesToStrings(double[] doubles) {
+        int size = doubles.length;
+        String[] strings = new String[size];
+
+        for(int i = 0; i < size; i++) {
+            strings[i] = "" + doubles[i];
+        }
+
+        return strings;
+    }
+
+    public void throwMessage(String message) throws Exception {
+        throw new Exception(message);
+    }
+}